1900.] FROM SINGAPORE AND MALACCA. 743 



XXXIII. Genus Pilumnus Leach. 



52. PlLUMNUS VESPERTILIO Eabr. 



Cancer vespertilio, Fabr. Suppl. Ent. Syst. p. 338 (1798). 



Pilumnus vespertilio, M.-Edw. Bust. Nat. Crust, t. i. p. 418 

 (1834). 



Pilumnus ursidus, Ad. & "White, ' Samarane; ' Crust, p. 45, pi. ix. 

 f. 6 (1848). 



Pilumnus mus, Dana, U.S. Expl. Exped., Crust, pt. i. p. 240 

 (1852). 



Pilumnus vespertilio, de Man, Mergui Crust, p. 58 (1888) ; 

 Walker, Journ. Linn. Soc, Zool. vol. xx. p. 110 (1887). 



Hah. Singapore ; littoral. One large male, four smaller ; a 

 small female, and a very young male. The granulations of the 

 under surface of the larger hand tend to disappear in the largest 

 male (ef. de Man, t. c). 



Dim*, tf 24-5x19. tf 13x10. rf 10x7. rf 10x7. 

 3 8-5x6-5. $ 10x7-5 



53. Pilumnus labtrinthicus Miers. 



Pilumnus labyrinthicus, Miers, ' Alert ' Crust, p. 224, pi. xxii. 

 f. C (1884); Walker, Journ. Linn. Soc, Zool. vol. xx. p. 110 

 (1887); Henderson, Trans. Linn. Soc, Zool. vol. v. p. 365 (1893). 



Eab. Singapore ; 5-15 fms., rough bottom. Two adult females 

 and three verv voung males. 



Dim. $ 12-5x10. $ 9x7-25. j 5x6. 



54. Pilumnus minutus hirsutus. 



? Pilumnus minutus, de Haan, Crust. Japon. p. 50, pi. iii. f. 2 

 (1839). 



Pilumnus hirsutus, Stimpson, Proc Ac. Nat. Sci. Philad. p. 37 

 (1858) ; Hasw. Cat. Austr. Crust, p. 69 (1882). 



Pilumnus minutus?, var. Jiirsutus, Miers, ' Challenger ' Brachvura, 

 p. 154 (1886). 



Hah. Singapore; littoral, from broken stones and coral. One 

 larger male, damaged, and two smaller. 



I agree with Mr. Miers in thinking it very probable that de 

 Haan's P. nmiutus is nearly identical with P. hirsutus of Stimpson. 



Dim. 6 9x7. J 6x4-5. S 4-5x3-5. 



55. Pilumnus l^evis Dana. 



Pilumnus kei'is, Daua, Conspectus Crust., Proc. Ac Xat. Sci. 

 Philad. vol. vi. p. 82 (1852) ; de Man, Mergui Crust, p. 66, pi. iv. 

 ff. 1-2 (1888) ; id. Zoolog. Jahrb. Bd. viii. p. 553 (1895). 



Hah. Singapore; ? depth. A small male. 



The infra-orbital margins may be seen to be finely granulous 

 under the lens, but there is no hiatus just under the outer orbital 

 angle on the right side ; as iu Dr. de Man's somewhat larger 



